Polyphase plate-circuit-excitation system



Oct. 28, 1924.

1,513,324 s. M. KINTNER POLYPHASE PLATE CIRCUIT EXCITATION SYSTEM FiledOct. 25. 1921- 1 TNESSE INVENTOR fi/ ZM Smw/M ff/mfler ATTORNEY vPatented Oct. 28, 1924.

UNITED STATES SAMUEL I. KINTNER, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOBTO WESTING- HOUSE ELECTRIC 6: MANUFACTURING COMPANY, A

VANIA.

CORPORATION 01 PENNSYL- POLYPE ASE PLATE-CIRCUTT-EXCITATION SYSTEM.

Application filed October 25, 1921. Serial No. 510,883.

To all whom it my camera:

Be it known that I, SAMUEL M. KINTNER, a citizen of the United States,and a resi dent of Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in PolyphasePlate Circuit Excitation Systems, of which the following is aspecification.

My invention relates to oscillation-generator systems and particularlyto such systems as are adapted to be energized by polyphase currents.

ne object of my invention is to provide an oscillation-generator systemwhich may be encr ized by three-phase alternating currents 0% commercialfrequency.

Another object of my invention is to provide a polyphaseplate-circuit-excitation system wherein the modulating effect of theimpressed alternating electromotive force upon the oscillatory currentsmay be so nullified'as to admit of the radiation of energy that shall beconstant in amplitude and in fr uency.

T ese and other objects and applications of my invention, whereby thesame may be practiced, will be apparent from the following description,when taken in connection with the accompanying drawing and claims.

Heretofore, in signalin systems employin vacuum tubes as osci lationgenerators, it as been customary to-energize the platefilament circuitsof the tubes from directcurrent sources of energy, such, for example, asdirect-current generators. As the size of the vacuum-tube oscillators isincreased, however, considerable difiiculty is experienced in obtainingthe higher plate voltages required, thereby necessitating, in manycases, dynamos of special construction.

Such difiiculties, on the other hand, are not present inalternating-current systems, as any voltage may easily be obtained byemploying transformers having the proper ratio. A disadvantage, however,of the singlebase alternating-current systems, hereto ore proposed,resides in the fact that the oscillating currents enerated by the tubesare modulated at frequencies corresponding to those of the impressedsupply currents, thereby resulting in the radiation of modulated energy.

In my invention, such difiic-ulties, as those inst mentioned, have beenovercome by ema three-phase supply system with a pair 0 oscillationgenerators for each phase. he modulated oscillatory currents generatedby each pair of oscillation generators may be combined in a singleradiating system to result in the passage of currents therein which aresubstantially constant in amplitude and in frequency, all as willbeherelnafter more fully described.

My invention may best be understood by reference to the accompanyingdrawing, in which the single figure is a diagrammatic View of c rcuitsand apparatus embodying my invention.

In the drawing, is shown a plurality of osc llation-generator systems 1,2 and 3 energized b phases 4, 5 and 6 of a polyphase source 0 energy of,preferably, true sinewave form and operatively cou led to an antennasystem 7 by means of coupling transformers 8, 9 and 11, respectively.The antenna system'7 comprises an antenna 12, a tuning coil 13,secondary windmgs 14, 15 and 16 of the transformers 8, 9 and 11,respectively, and a ground conductor 17.

Each oscillation-generator system comprises a pair of vacuum-tubeoscillation generators 18 and 19, the output or plate-filament circuitsof each being oppositely associated with respect to a common portion 21.The portion of the output circuits common to each pair of oscillationgenerators may include a condenser 22, around which one phase of thepolyphase source of energy is connected, and a primary Winding 23 of thecoupling transformers.

The vacuum-tube oscillation generators, in each system, for convenienceof illustration, are shown as three-electrode tubes of a type Well knownin the art and comprise a filament 21', a grid 22 and an anode 23. Thefilament 21' may be energized by means of a source of energy 24 througha resistor 25. A plate-filament circuit comprises the condenser 22, theprimary winding 23 of one of the coupling transformers and a coil 26 ofa feed-back transformer 27. The coil 26 may be shunted by means of avariable condenser 28.

Energy-may be supplied to the grid-filament circuit necessary to sustainthe oscillations in the plate-filament circuit through the feed-backtransformer 27 the remaining coil 29 of which is included in thegridployinfg filament circuit. As shown in the drawing, thegrid-filament circuit is also electr cally connected to theplate-filament circuit by means of a conductor 31 which connectscorrespondin terminals of the coils 2 6 and 29. The Eigh-frequencyoscillations in the plate-filament circuit are prevented from traversingthe supply circuit by means of reactors 32 which are included in thesupply conductors of each phase. I

In 0 eration, when power is supplied to the oscillation-generatorsystems 1, 2 and 3, sustained oscillator currents are caused to traversethe platelament circuits of each oscillator tube during those portionsof the cycle when the impressed electromotive force in the plate circuitis positive in value. Thus, the primary winding 23 of each of thetransformers 8, 9 and 11 is traversed by currents generated by one tubeduring one halfwave of theimpressed electromotive force and by currentsgenerated by the remaining tube during the other half-wave of the im-.

pressed electromotive force.

While the resultant oscillatory currents traversing each of the primarywindings 23 of the coupling transformers 8, 9 and 11 are thus modulatedat a frequency corresponding to the supply current, the combined effectof all of the oscillatory currents in the antenna circuit 7 is toproduce an oscillating current of substantially constant amplitude andfrequency.

The radiation of the energy in the antenna circuit may be modulated byany means well known to the art and, as the modulation means forms nopart of my invention, it has been omitted.

It will be noted that, while I have shown oscillation-generator systemsof a particular type, my invention is not limited thereto. I desire,therefore, that only such limitations shall be imposed upon my inventionas are indicated in the appended claims.

I claim as m invention:

1. In a wire ess transmission system, the combination with a polyphasepower source, of a plurality of oscillation-generator systems, saidsystems being oppositely connected in pairs to the respective phases ofsaid polyphase source, and a circuit associated with all of said pairsof oscillationgenerator systems and adapted to be energized thereby. I

2. In a wireless transmission system, a polyphase power source, aplurality of pairs of oscillation-generator systems, said systems beingoppositely connected in pairs to the respective phases of said polyphasesource, a common element for each of said pairs of oppositely connectedsystems and a circuit including means associated with said commonelements, whereby said circuit may be energized by saidoscillationgenerator systems.

3. Ida wireless transmission system, a plurality of'pairs ofoscillation-generator systems, each pair of oscillation generators beingoppositely associated with respect to a common element, a polyphasepower source to provide one phase for each pair of oscillationgenerators, said phases being oppositely associated with the oscillationgenerator in each pair, and a circuit operatively associated with saidelements, whereby said circuit may be energized by saidoscillationgenerator systems.

4. In a wireless transmission system, a plurality of pairs ofoscillationgenerators, each pair of oscillation generators having output circuits,an element common to said output circuits and oppositely associatedtherewith, a polyphase power source to provideone phase for each pair ofoscillation generators, each phase being oppositely associated with theoscillation generators in each pair, and a circuit including meansassociated with said elements, whereb said circuit may be energized bysaid osc' tiongenerator systems.

5. In a Wireless transmission system, a plurality of pairs ofoscillation generators, each pair of oscillation generators havin outputcircuits, an element common to said output circuits and oppositelyassociated therewith, a polyphase source of, electromotive force toprovide one phase for each pair of oscillation generators, each phasebeing oppositely associated with the oscillation generators in eachpair, and a radiating circuit operatively connected to said elements,whereby said radiating circuit may be energized by said oscillationgenerators.

6. In a wireless transmission system, a plurality of pairs ofoscillation generators, each pair of oscillation generators havingoutput circuits, said output circuits in each pair having a commonconductor and being oppositely associated therewith, a polyphase sourceof energy to provide one phase for each pair of oscillation generators,said phases being operatively connected to said common conductor, and aradiating circuit operatively associated to said oscillation generatorsystems and adapted to be energized thereby.

7. In a wireless transmission system, a plurality of pairs ofvacuum-tube oscillation generators, each pair of vacuum tubes havingoutput circuits, said output circuits having a common conductor and beinsitely associated therewith, a pdlyphase source of energy to provide onephase for each pair of oscillation generators, each phase beingconnected to said common conductor, and a radiating circuit operativelyassociated with said oscillation-generator systems and adapted to beenergized thereby.

8. In a wireless transmission system, polyphase source of energy, aplurality OPPO- a of 1' pairs of vacuum-tube oscillation generators, onefor each phase, each pair of oscillation generators being so connectedas to utilize both half waves of the impresed electromotive force, and aradiating system operatively associated with said pairs of vacuum-tubeoscillation generators and adapted to be energized thereby.

9. In a wireless transmission system, a polyphase source of energy, aplurality of pairs of oscillation generators, one for each phase, oneoscillation generator in each pair being adapted to generate oscillatorycurrents during one half Wave and the remaining oscillation generatorbeing adapted to generate oscillatory currents durin the remaining halfWave of each cycle 0 the impressed electromotive force, each of saidpairs of oscillation generators including a common coil, and a radiatingsystem including means operatively associated with said common coils,whereby said radiating system may be energized.

10. In a Wireless transmission-system, the combination with asymmetrical polyphase power source, of a plurality of pairs ofoscillation generators, one pair for each phase, the oscillationgenerators of each pair being oppositely connected to the respwtivephases, and a common circuit energized by all saidoscillation-generators, whereby a uniform sustained oscillating currentis produced in said common circuit.

In testimony whereof, I have hereunto subscribed my name this 18th dayof O0- tober, 1921.

SAMUEL M. KINTNER.

